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What is the best way to concatenate two vectors?
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332
AB.reserve( A.size() + B.size() ); // preallocate memory
AB.insert( AB.end(), A.begin(), A.end...
What is the difference between ${var}, “$var”, and “${var}” in the Bash shell?
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Braces ($var vs. ${var})
In most cases, $var and ${var} are the same:
var=foo
echo $var
# foo...
How can I sharpen an image in OpenCV?
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163
One general procedure is laid out in the Wikipedia article on unsharp masking:
You use a Gaussia...
Where are shared preferences stored?
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243
SharedPreferences are stored in an xml file in the app data folder, i.e.
/data/data/YOUR_PACKAG...
一分钟读懂低功耗蓝牙(BLE) MTU交换数据包 - 创客硬件开发 - 清泛IT社区，...
...设备发出一个150个字节的MTU请求，但是从设备回应MTU是23字节，那么今后双方要以较小的值23字节作为以后的MTU），主从双方约定每次在做数据传输时不超过这个最大数据单元。
MTU交换通常发生在主从双方建立连接关...
What is the benefit of using “SET XACT_ABORT ON” in a stored procedure?
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234
SET XACT_ABORT ON instructs SQL Server to rollback the entire transaction and abort the batch w...
How to convert a SVG to a PNG with ImageMagick?
...ust for reference, my Inkscape version (on Ubuntu 12.04) is:
Inkscape 0.48.3.1 r9886 (Mar 29 2012)
and on Windows 7, it is:
Inkscape 0.48.4 r9939 (Dec 17 2012)
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How to check whether a file is empty or not?
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361
>>> import os
>>> os.stat("file").st_size == 0
True
...
How could I use requests in asyncio?
..._complete(main())
This will get both responses in parallel.
With python 3.5 you can use the new await/async syntax:
import asyncio
import requests
async def main():
loop = asyncio.get_event_loop()
future1 = loop.run_in_executor(None, requests.get, 'http://www.google.com')
future2 = ...
How to check if running as root in a bash script
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430
The $EUID environment variable holds the current user's UID. Root's UID is 0. Use something lik...